Battery piece, battery string, photovoltaic module and photovoltaic power generation system

Abstract

The utility model discloses a battery piece, a battery string, a photovoltaic assembly and a photovoltaic power generation system, the battery piece comprises a battery piece body, a first grid line, a second grid line, a first edge grid line, a second edge grid line, a first connection grid line and a second connection grid line, the first grid line comprises a plurality of first grid line segments, the second grid line comprises a plurality of second grid line segments, and the first connection grid line is connected with the second connection grid line. The first edge grid line is connected with one end of each of the plurality of first grid lines, the first edge grid line is separated from the plurality of second grid lines, the second edge grid line is separated from the plurality of first grid lines, and the second edge grid line is connected with one end of each of the plurality of second grid lines; the first connecting grid line is connected between at least two adjacent first grid line segments adjacent to the second edge grid line, and the second connecting grid line is connected between at least two adjacent second grid line segments adjacent to the first edge grid line. According to the battery piece provided by the utility model, the reliability of the battery piece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic, in particular to a battery cell, a battery string, a photovoltaic module and a photovoltaic power generation system. Background Art

[0002] A back-contact solar cell is a cell in which both the emitter and base contact electrodes are placed on the back surface (non-light-receiving surface) of the cell, and there is no metal electrode blocking on the light-receiving surface of the cell. In related technologies, the cell has a main grid design, with a large consumption of silver and high production costs. For a cell without a main grid, when the cell is used in a battery string, if the connection between the welding tape and some fine grids is not firm, the current on the fine grid line cannot be exported, thus increasing the power loss of the cell and reducing the reliability of the battery string. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, one object of the utility model is to provide a battery cell, which improves the reliability of use of the battery string when the battery cell is used in the battery string by providing a first connection grid line and a second connection grid line.

[0004] The second object of the utility model is to provide a battery string using the above battery cell.

[0005] The third object of the utility model is to provide a photovoltaic module using the above battery cell or battery string.

[0006] The fourth object of the utility model is to provide a photovoltaic power generation system using the above battery cell, battery string or photovoltaic module.

[0007] The solar cell according to the embodiment of the first aspect of the present invention includes: a solar cell body; a plurality of first grid lines and a plurality of second grid lines, the first grid lines and the second grid lines are provided on one side in the thickness direction of the solar cell body, the plurality of first grid lines and the plurality of second grid lines are alternately arranged at intervals along a first direction, the polarities of the first grid lines and the second grid lines are opposite, the first grid lines include a plurality of first grid line segments, the second grid lines include a plurality of second grid line segments, and the plurality of first grid line segments and the plurality of second grid line segments are respectively arranged at intervals along a second direction; a first edge grid line and a second edge grid line, the first edge grid line and the second edge grid line extend along the first direction and are respectively arranged on both sides of the solar cell body along the second direction, the first edge grid line is connected to one end of each of the plurality of first grid lines, the first edge grid line is spaced apart from the plurality of second grid lines, the second edge grid line is spaced apart from the plurality of first grid lines, and the second edge grid line is connected to one end of each of the plurality of second grid lines; at least one first connection grid line and at least one second connection grid line, the first connection grid line is connected between at least two adjacent ones of the plurality of first grid line segments adjacent to the second edge grid line, and the second connection grid line is connected between at least two adjacent ones of the plurality of second grid line segments adjacent to the first edge grid line.

[0008] According to the embodiment of the first aspect of the present invention, the first connection grid line can realize the electrical connection between two first grid line segments connected thereto, and the second connection grid line can realize the electrical connection between two second grid line segments connected thereto, which is beneficial to the normal use of the solar cell. When the solar cell is used in a battery string, it is beneficial for the second interconnecting structure to collect the current on the two first grid line segments connected to the first connection grid line, and it is also beneficial for the first interconnecting structure to collect the current on the two second grid line segments connected to the second connection grid line, improving the connection reliability between the first grid line segment and the corresponding second interconnecting structure, and also improving the connection reliability between the second grid line segment and the corresponding first interconnecting structure, thereby improving the service performance of the solar cell and the battery string.

[0009] According to some embodiments of the present invention, there are a plurality of first connection grid lines. Two adjacent first grid line segments along the first direction form a group, and a first connection grid line is connected between two adjacent first grid line segments in each group; there are a plurality of second connection grid lines. Two adjacent second grid line segments along the first direction form a group, and a second connection grid line is connected between two adjacent second grid line segments in each group.

[0010] According to some embodiments of the present invention, the plurality of first connection grid lines are linearly arranged along the first direction, and the plurality of second connection grid lines are linearly arranged along the first direction.

[0011] According to some embodiments of the present utility model, a first break opening is defined between the first gate line segments, and a plurality of the first break openings are opposite to each other along the first direction. The second connecting gate line passes through the first break opening, and two ends of the second connecting gate line are respectively connected to two adjacent second gate line segments in each group; a second break opening is defined between the second gate line segments, and a plurality of the second break openings are opposite to each other along the first direction. The first connecting gate line passes through the second break opening, and two ends of the second connecting gate line are respectively connected to two adjacent first gate line segments in each group.

[0012] According to some embodiments of the present utility model, two adjacent first gate line segments adjacent to the first edge gate line are connected to each other to form a first diversion gate line, and the width of at least a part of the first diversion gate line is greater than the width of the first gate line segment; and / or, two adjacent second gate line segments adjacent to the second edge gate line are connected to each other to form a second diversion gate line, and the width of at least a part of the second diversion gate line is greater than the width of the second gate line segment.

[0013] According to some embodiments of the present utility model, the first diversion gate line is located between two adjacent second connecting gate lines; the second diversion gate line is located between two adjacent first connecting gate lines.

[0014] According to some embodiments of the present utility model, the ratio of the width of the at least a part of the first diversion gate line to the width of the first gate line segment is b 1 , wherein the b 1 satisfies: 2 ≤ b 1 ≤ 4; and / or, the ratio of the width of the at least a part of the second diversion gate line to the width of the second gate line segment is b 2 , wherein the b 2 satisfies: 2 ≤ b 2 ≤ 4.

[0015] According to some embodiments of the present utility model, one end of the first diversion gate line is connected to the first edge gate line, and the other end of the first diversion gate line extends at least to a position opposite to the second break opening adjacent to the first edge gate line; and / or, one end of the second diversion gate line is connected to the second edge gate line, and the other end of the second diversion gate line extends at least to a position opposite to the first break opening adjacent to the second edge gate line.

[0016] According to some embodiments of the present utility model, the number of the first diversion gate lines is N 1 , the number of the second diversion gate lines is N 2 , the length of the first edge gate line is L 1 , the length of the second edge gate line is L 2, wherein, the N 1 、N 2 、L 1 and L 2 satisfy the relationship: 5 ≤ L 1 / N 1 ≤ 15, 5 ≤ L 2 / N 2 ≤ 15.

[0017] According to some embodiments of the present utility model, the ratio of the width of the first edge gate line to the width of the first gate segment is b 3 , wherein, the b 3 satisfies: 2 ≤ b 3 ≤ 4; and / or, the ratio of the width of the second edge gate line to the width of the second gate segment is b 4 , wherein, the b 4 satisfies: 2 ≤ b 4 ≤ 4.

[0018] The battery string according to the embodiment of the second aspect of the present utility model includes: a plurality of battery cells, the battery cells being the battery cells according to the embodiment of the first aspect described above; a plurality of interconnecting structural members, and adjacent two of the battery cells are electrically connected through the plurality of interconnecting structural members.

[0019] According to some embodiments of the present utility model, the plurality of interconnecting structural members include: a plurality of first interconnecting structural members, the first interconnecting structural members are respectively insulated and connected to the plurality of first gate lines of the battery cells, and are electrically connected to the plurality of second gate lines of the battery cells, the plurality of first interconnecting structural members include first edge interconnecting structural members, and the first edge interconnecting structural members are electrically connected to the second connection gate lines; a plurality of second interconnecting structural members, the second interconnecting structural members are respectively insulated and connected to the second gate lines, and are electrically connected to the first gate lines, the plurality of second interconnecting structural members include second edge interconnecting structural members, and the second edge interconnecting structural members are electrically connected to the first connection gate lines.

[0020] The photovoltaic module according to the embodiment of the third aspect of the present utility model includes the battery cells according to the embodiment of the first aspect described above, or the battery string according to the embodiment of the second aspect described above.

[0021] The photovoltaic power generation system according to the embodiment of the fourth aspect of the present utility model includes the battery cells according to the embodiment of the first aspect described above, or the battery string according to the embodiment of the second aspect described above, or the photovoltaic module according to the embodiment of the third aspect described above.

[0022] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0024] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present utility model;

[0025] Figure 2 is a schematic diagram of a battery cell according to an embodiment of the present utility model, wherein an adhesive is shown on the battery cell;

[0026] Figure 3 is a partial schematic diagram of a battery string according to an embodiment of the present utility model;

[0027] Figure 4 is a partial schematic diagram of a battery string according to another embodiment of the present utility model.

[0028] Reference numerals:

[0029] 100, battery cell; 200, battery string;

[0030] 1, battery cell body;

[0031] 2, first grid line; 21, first grid line segment; 22, first break opening; 23, first diversion grid line;

[0032] 3, second grid line; 31, second grid line segment; 32, second break opening; 33, second diversion grid line;

[0033] 4, first edge grid line; 5, second edge grid line;

[0034] 6, first connection grid line; 7, second connection grid line;

[0035] 8, interconnecting structure; 81, first interconnecting structure; 811, first edge interconnecting structure;

[0036] 82, second interconnecting structure; 821, second edge interconnecting structure;

[0037] 9, adhesive; 10, positioning member. Detailed implementation manners

[0038] The embodiments of the present utility model will be described in detail below. The embodiments described with reference to the drawings are exemplary. Below, reference is made to Figures 1 - 4 Describe the battery cell 100 according to an embodiment of the present utility model. In the description of the present application, the battery cell 100 is used as an example for a battery string 200 of a photovoltaic module for illustration.

[0039] As Figure 1As shown, the solar cell 100 according to the first aspect embodiment of the present utility model includes a solar cell body 1, a plurality of first grid lines 2, a plurality of second grid lines 3, a first edge grid line 4, a second edge grid line 5, at least one first connection grid line 6, and at least one second connection grid line 7. In the description of the present utility model, "a plurality of" means two or more.

[0040] Specifically, the first grid lines 2 and the second grid lines 3 are provided on one side of the solar cell body 1 in the thickness direction. The plurality of first grid lines 2 and the plurality of second grid lines 3 are alternately arranged at intervals along the first direction. The first grid lines 2 and the second grid lines 3 have opposite polarities. The first grid line 2 includes a plurality of first grid line segments 21, and the second grid line 3 includes a plurality of second grid line segments 31. The plurality of first grid line segments 21 and the plurality of second grid line segments 31 are respectively arranged at intervals along the second direction. The first direction and the second direction are perpendicular. The first edge grid line 4 and the second edge grid line 5 extend along the first direction and are respectively provided on both sides of the solar cell body 1 along the second direction. The first edge grid line 4 is connected to one end of each of the plurality of first grid lines 2, and the first edge grid line 4 is spaced apart from each of the plurality of second grid lines 3. The second edge grid line 5 is spaced apart from each of the plurality of first grid lines 2, and the second edge grid line 5 is connected to one end of each of the plurality of second grid lines 3 (for example Figure 1 the right end of the second grid line 3 in the figure). It can also be said that the first edge grid line 4 is connected to one end of each of the plurality of first grid lines 2 (for example Figure 1 the left end of the first grid line 2 in the figure), the first edge grid line 4 is spaced apart from one end of each of the plurality of second grid lines 3 (for example Figure 1 the left end of the second grid line 3 in the figure), the second edge grid line 5 is spaced apart from the other end of each of the plurality of first grid lines 2 (for example Figure 1 the right end of the first grid line 2 in the figure), and the second edge grid line 5 is connected to the other end of each of the plurality of second grid lines 3 (for example Figure 1 the right end of the second grid line 3 in the figure).

[0041] For example, in the Figure 1 example, the plurality of first grid lines 2 and the plurality of second grid lines 3 are alternately arranged at intervals in the up-down direction. The first grid lines 2 and the second grid lines 3 both extend in the left-right direction. The plurality of first grid line segments 21 are arranged at intervals in the left-right direction, and the plurality of second grid line segments 31 are arranged at intervals in the left-right direction. The opposite polarities of the first grid lines 2 and the second grid lines 3 can be understood as: when the first grid line 2 is a positive grid line, the second grid line 3 is a negative grid line; when the first grid line 2 is a negative grid line, the second grid line 3 is a positive grid line. The plurality of first grid lines 2 and the second grid lines 3 are located between the first edge grid line 4 and the second edge grid line 5. The left ends of the first edge grid line 4 and the plurality of first grid lines 2 are respectively connected, the first edge grid line 4 and the plurality of second grid lines 3 are spaced apart at the left ends, the second edge grid line 5 and the plurality of first grid lines 2 are spaced apart at the right ends, and the plurality of second edge grid lines 5 and the plurality of second grid lines 3 are connected at the right ends.

[0042] Combination Figure 3 When the solar cell 100 is used in the solar cell string 200, a plurality of solar cells 100 are sequentially connected into the solar cell string 200 through a plurality of interconnecting members 8 such as solder tapes. The plurality of interconnecting members 8 include a plurality of first interconnecting members 81 and a plurality of second interconnecting members 82. The plurality of first interconnecting members 81 are respectively insulated and connected to the plurality of first grid lines 2. The plurality of first interconnecting members 81 are respectively spaced apart from the ends of the corresponding plurality of first grid line segments 21. The plurality of first interconnecting members 81 are respectively electrically connected to the plurality of second grid lines 3. The plurality of second interconnecting members 82 are respectively insulated and connected to the plurality of second grid lines 3. The plurality of second interconnecting members 82 are respectively spaced apart from the ends of the corresponding plurality of second grid line segments 31. The plurality of second interconnecting members 82 are respectively electrically connected to the plurality of first grid lines 2.

[0043] With such an arrangement, by providing a plurality of first grid line segments 21 and second grid line segments 31, the insulated connection between the first grid line 2 and the first interconnecting member 81 and the insulated connection between the second grid line 3 and the second interconnecting member 82 can be achieved, improving the reliability of use of the solar cell 100. And there is no need to use other structural members or insulating adhesives to achieve insulation, reducing the amount of insulating adhesive used, lowering the cost, simplifying the structure of the solar cell 100, facilitating production and processing, and having a lower production cost. In addition, the material usage of the first grid line 2 and the second grid line 3 is reduced, thereby reducing the production cost of the first grid line 2 and the second grid line 3, and further reducing the production cost of the solar cell 100. Additionally, by providing the first edge grid line 4 and the second edge grid line 5, the first edge grid line 4 is connected to the plurality of first grid line segments 21 at the leftmost end of the plurality of first grid lines 2, and the first edge grid line 4 can collect the current on the plurality of first grid line segments 21. The second edge grid line 5 is connected to the plurality of second grid line segments 31 at the rightmost end of the plurality of second grid lines 3, and the second edge grid line 5 can collect the current on the plurality of second grid line segments 31 to avoid current loss.

[0044] Referring to Figure 1 , the first connection grid line 6 is connected between at least two adjacent ones of the plurality of first grid line segments 21 adjacent to the second edge grid line 5 among the plurality of first grid lines 2, and the second connection grid line 7 is connected between at least two adjacent ones of the plurality of second grid line segments 31 adjacent to the first edge grid line 4 among the plurality of second grid lines 3. For example, in the example of Figure 1 , the first connection grid line 6 is provided between at least two adjacent ones of the plurality of first grid line segments 21 close to the second edge grid line 5, and the second connection grid line 7 is provided between at least two adjacent ones of the plurality of second grid line segments 31 close to the first edge grid line 4.

[0045] With such a setting, the first connecting gate line 6 can achieve the electrical connection between two first gate line segments 21 connected thereto, and the second connecting gate line 7 can achieve the electrical connection between two second gate line segments 31 connected thereto. When the solar cell 100 is used in the battery string 200, the first connecting gate line 6 can be connected to the second interconnection structure member 82 at the corresponding position, and the second connecting gate line 7 can be connected to the corresponding first interconnection structure member 81. For example, when there is a gap or unreliable connection between the second interconnection structure member 82 and the connection point of the first gate line segment 21 connected to the upper end of the first connecting gate line 6, the current on the first gate line segment 21 above the first connecting gate line 6 can be electrically connected to the second interconnection structure member 82 through the first connecting gate line 6 and the first gate line segment 21 connected to the lower end of the first connecting gate line 6, which is beneficial to the second interconnection structure member 82 collecting the current on the two first gate line segments 21 connected to the first connecting gate line 6, improving the connection reliability between the first gate line segment 21 and the corresponding second interconnection structure member 82, and also improving the connection reliability between the second gate line segment 31 and the corresponding first interconnection structure member 81. That is to say, when the first gate line segment 21 adjacent to the second edge gate line 5 is disconnected from the corresponding second interconnection structure member 82, the above-mentioned first gate line segment 21 can be electrically connected to the second interconnection structure member 82 through the first connecting gate line 6 and the adjacent first gate line segment 21 to ensure the collection of the current of the second interconnection structure member 82. Of course, the connection between the first interconnection structure member 81 and the corresponding second connecting gate line 7 is similar to the connection between the second interconnection structure member 82 and the first gate line segment 21.

[0046] In addition, the contact area between the first connecting grid line 6 and the second interconnecting structural member 82 is increased, and the contact area between the second connecting grid line 7 and the first interconnecting structural member 81 is increased. The connection reliability between the first connecting grid line 6 and the corresponding second interconnecting structural member 82 is improved, and the connection reliability between the second connecting grid line 7 and the corresponding first interconnecting structural member 81 is improved, further improving the service reliability of the battery cell 100. Additionally, when the second grid segment 31 adjacent to the first connecting grid line 6 in the up-down direction is insulated and connected to the corresponding second interconnecting structural member 82 through insulating glue, and the first grid segment 21 adjacent to the second connecting grid line 7 in the up-down direction is insulated and connected to the corresponding first interconnecting structural member 81 through insulating glue, the insulating member will increase the spacing between the second interconnecting structural member 82, the first interconnecting structural member 81 and the battery cell 100. By providing the first connecting grid line 6 and the second connecting grid line 7, the first connecting grid line 6 can reduce the distance between the battery cell 100 and the corresponding second interconnecting structural member 82, and the second connecting grid line 7 can reduce the distance between the battery cell 100 and the corresponding first interconnecting structural member 81. It is not necessary to print solder paste on the corresponding first grid segment 21 and second grid segment 31 to increase the height to improve the welding performance, and reliable connection between the first interconnecting structural member 81 and multiple second grid segments 31 can also be achieved, and reliable connection between the second interconnecting structural member 82 and multiple first grid segments 21 can be achieved, further improving the service reliability of the battery cell 100.

[0047] For the battery cell 100 according to an embodiment of the present invention, the first connecting grid line 6 can realize the electrical connection between two first grid segments 21 connected thereto, and the second connecting grid line 7 can realize the electrical connection between two second grid segments 31 connected thereto, which is beneficial to the normal use of the battery cell 100. When the battery cell 100 is used in the battery string 200, it is beneficial for the second interconnecting structural member 82 to collect the current on the two first grid segments 21 connected to the first connecting grid line 6, and it is also beneficial for the first interconnecting structural member 81 to collect the current on the two second grid segments 31 connected to the second connecting grid line 7, improving the connection reliability between the first grid segment 21 and the corresponding second interconnecting structural member 82, and also improving the connection reliability between the second grid segment 31 and the corresponding first interconnecting structural member 81, thereby improving the service performance of the battery cell 100 and the battery string 200.

[0048] According to some embodiments of the present invention, in combination with Figure 1 , there are multiple first connecting grid lines 6. Two adjacent first grid segments 21 in the first direction form a group, and a first connecting grid line 6 is connected between the two adjacent first grid segments 21 in each group. There are multiple second connecting grid lines 7. Two adjacent second grid segments 31 in the first direction form a group, and a second connecting grid line 7 is connected between the two adjacent second grid segments 31 in each group.

[0049] For example, in Figure 1In the example, a plurality of first connection grid lines 6 and a plurality of second connection grid lines 7 are respectively provided. The plurality of first connection grid lines 6 are arranged at intervals along the first direction, and the plurality of second connection grid lines 7 are also arranged at intervals along the first direction. For two adjacent first grid segments 21 in each group, one end of the first connection grid line 6 is connected to one of the two first grid segments 21, and the other end of the first connection grid line 6 is connected to the other of the two first grid segments 21. For two adjacent second grid segments 31 in each group, one end of the second connection grid line 7 is connected to one of the two second grid segments 31, and the other end of the second connection grid line 7 is connected to the other of the two second grid segments 31. It should be noted that the number of the first connection grid lines 6 and the second connection grid lines 7 can be correspondingly set according to the size of the battery cell 100 to better meet the normal use of the battery cell 100.

[0050] With such a setting, by providing a plurality of first connection grid lines 6, the second interconnect structure 82 close to the second edge grid line 5 is connected to the corresponding plurality of first connection grid lines 6, increasing the contact area between the plurality of first connection grid lines 6 and the corresponding second interconnect structure 82. Thus, the plurality of first grid segments 21 close to the second edge grid line 5 are not only electrically connected to the corresponding second interconnect structure 82, but can also be respectively connected to the second interconnect structure 82 through the corresponding first connection grid lines 6, further improving the connection reliability between the second interconnect structure 82 and the plurality of first grid segments 21, and being more conducive to the long-term stable use of the battery cell 100. By providing a plurality of second connection grid lines 7, the first interconnect structure 81 close to the first edge grid line 4 is connected to the corresponding plurality of second connection grid lines 7, increasing the contact area between the plurality of second connection grid lines 7 and the corresponding first interconnect structure 81. Thus, the plurality of second grid segments 31 close to the first edge grid line 4 are not only electrically connected to the corresponding first interconnect structure 81, but can also be respectively connected to the first interconnect structure 81 through the corresponding second connection grid lines 7, further improving the connection reliability between the first interconnect structure 81 and the plurality of second grid segments 31, and being more conducive to the long-term stable use of the battery cell 100. In addition, the material amount of the first connection grid lines 6 and the second connection grid lines 7 is reduced, thereby reducing the production cost of the battery cell 100. Additionally, it is possible to prevent the two ends of the first connection grid line 6 from extending to adjacent second grid segments 31, and it is also possible to prevent the two ends of the second connection grid line 7 from extending to adjacent first grid segments 21, thereby avoiding short circuits in the battery cell 100.

[0051] According to some embodiments of the present invention, referring to the figure, the plurality of first connection grid lines 6 are arranged in a straight line along the first direction, and the plurality of second connection grid lines 7 are arranged in a straight line along the first direction. For example, as Figure 2As shown, four first connecting grid lines 6 and four second connecting grid lines 7 are respectively provided, and each first connecting grid line 6 and the corresponding two first grid line segments 21 are connected to form a roughly "I" shape, and each second connecting grid line 7 and the corresponding two second grid line segments 31 are connected to form a roughly "I" shape. Such a configuration, on the one hand, simplifies the structure of the first connecting grid lines 6 and the second connecting grid lines 7, is conducive to the production and processing of the first connecting grid lines 6 and the second connecting grid lines 7, reduces the production difficulty, and can also save the amount of silver paste used for the first connecting grid lines 6 and the second connecting grid lines 7, thereby reducing the production cost of the battery cell 100. On the other hand, it is conducive to the full contact between the first connecting grid lines 6 and the second connecting grid lines 7 and the corresponding interconnection structural members 8, so as to further improve the connection reliability between the first connecting grid lines 6 and the second connecting grid lines 7 and the corresponding interconnection structural members 8, thereby further improving the use reliability of the battery string 200.

[0052] According to some embodiments of the present invention, referring to Figure 2 , a first disconnection opening 22 is defined between the first gate line segments 21, and a plurality of first disconnection openings 22 are opposite to each other along the first direction, a second connection gate line 7 passes through the first disconnection opening 22, and two ends of the second connection gate line 7 are respectively connected to two adjacent second gate line segments 31 of each group. A second disconnection opening 32 is defined between the second gate line segments 31, and a plurality of second disconnection openings 32 are opposite to each other along the first direction, a first connection gate line 6 passes through the second disconnection opening 32, and two ends of the second connection gate line 7 are respectively connected to two adjacent first gate line segments 21 of each group.

[0053] That is to say, a first disconnection opening 22 is defined between two adjacent first gate line segments 21 of the first gate line 2, and multiple first disconnection openings 22 of multiple first gate lines 2 are opposite to each other along the first direction; a second disconnection opening 32 is defined between two adjacent second gate line segments 31 of the second gate line 3, and multiple second disconnection openings 32 of multiple second gate lines 3 are opposite to each other along the first direction.

[0054] For example, in Figure 1 and Figure 2 In the example, the plurality of first disconnected openings 22 of each first gate line 2 are arranged along the second direction (eg, Figure 1are arranged at intervals in the left - right direction (in the figure), and the multiple first break - openings 22 of the multiple first grid lines 2 are arranged in multiple columns in an up - down opposite manner respectively, and the multiple columns of the first break - openings 22 are arranged at intervals in the second direction. The multiple second break - openings 32 of each second grid line 3 are arranged at intervals in the second direction, and the multiple second break - openings 32 of the multiple second grid lines 3 are arranged in multiple columns in an up - down opposite manner respectively, and the multiple columns of the second break - openings 32 and the multiple columns of the first break - openings 22 are arranged alternately in the second direction. One end of the first connecting grid line 6 is connected to one of the first grid line segments 21 in the same group, and the other end of the first connecting grid line 6 passes through the corresponding second break - opening 32 and is connected to another first grid line segment 21 in the same group. One end of the second connecting grid line 7 is connected to one of the second grid line segments 31 in the same group, and the other end of the second connecting grid line 7 passes through the corresponding first break - opening 22 and is connected to another second grid line segment 31 in the same group. It should be noted that the structures of the first connecting grid line 6 and the second connecting grid line 7 are the same.

[0055] Thus, by providing the first break - openings 22 and the second break - openings 32, the multiple first interconnection structural members 81 can achieve insulated connection with the multiple first grid lines 2 by being provided at the corresponding multiple first break - openings 22, and the multiple second interconnection structural members 82 can achieve insulated connection with the multiple second grid lines 3 by being provided at the corresponding multiple second break - openings 32, without using other structures for insulation, which is beneficial to the connection between the battery cell 100 and the interconnection structural members 8. In addition, the first connecting grid line 6 can pass through the corresponding second break - opening 32, and the second connecting grid line 7 can pass through the corresponding first break - opening 22, thus reasonably utilizing the first break - openings 22 and the second break - openings 32. While ensuring the connection between the first connecting grid line 6 and the second interconnection structural member 82 and the connection between the second connecting grid line 7 and the first interconnection structural member 81, it can avoid the first connecting grid line 6 from contacting the corresponding second grid line segment 31, and can also avoid the second connecting grid line 7 from contacting the corresponding first grid line segment 21, thereby avoiding the short - circuit of the battery cell 100 and ensuring the normal use of the battery cell 100.

[0056] According to some embodiments of the present invention, in combination with Figure 1 and Figure 2 , two adjacent first grid line segments 21 adjacent to the first edge grid line 4 are connected to each other to form a first diversion grid line 23, and the width of at least a part of the first diversion grid line 23 is greater than the width of the first grid line segment 21. And / or, two adjacent second grid line segments 31 adjacent to the second edge grid line 5 are connected to each other to form a second diversion grid line 33, and the width of at least a part of the second diversion grid line 33 is greater than the width of the second grid line segment 31.

[0057] For example, in Figure 1 and Figure 2In the example, two adjacent first grid line segments 21 of at least one of the plurality of first grid lines 2 adjacent to the first edge grid line 4 are connected to each other to form a first diversion grid line 23, that is, at least one of the plurality of first grid lines is continuous at the first break opening 22 adjacent to the first edge grid line 4. Two adjacent second grid line segments 31 of at least one of the plurality of second grid lines 3 adjacent to the second edge grid line 5 are connected to each other to form a second diversion grid line 33, that is, at least one of the plurality of second grid lines is continuous at the second break opening 32 adjacent to the second edge grid line 5. It should be noted that the numbers of the first diversion grid line 23 and the second diversion grid line 33 can be set according to actual situations. For example, when the first diversion grid line 23 is set to be multiple, the multiple first diversion grid lines 23 can be arranged at equal intervals in the first direction. The number of the first diversion grid lines 23 can be the same as or different from the number of the first grid lines 2. Alternatively, the first grid lines 2 with the first diversion grid line 23 and the first grid lines 2 without the first diversion grid line 23 are arranged alternately at intervals. The setting principle of the second diversion grid line 33 is similar to that of the first diversion grid line 23.

[0058] When the solar cell 100 is used in the battery string 200, the second interconnection structure members 82 adjacent to the first edge grid line 4 among the plurality of second interconnection structure members 82 are opposite to the plurality of second break openings 32 adjacent to the first edge grid line 4, and are respectively electrically connected to the corresponding plurality of first grid line segments 21 (that is, the plurality of first grid line segments 21 vertically opposite to the plurality of second break openings 32 adjacent to the first edge grid line 4) and the first diversion grid line 23. The first interconnection structure members 81 adjacent to the second edge grid line 5 among the plurality of first interconnection structure members 81 are opposite to the plurality of first break openings 22 adjacent to the second edge grid line 5, and are respectively electrically connected to the corresponding plurality of second grid line segments 31 (that is, the plurality of second grid line segments 31 vertically opposite to the plurality of first break openings 22 adjacent to the second edge grid line 5) and the second diversion grid line 33.

[0059] With such a setting, the second interconnecting structure 82 adjacent to the first edge gate line 4 can collect the current converted on the corresponding plurality of first gate line segments 21. At the same time, the current of the plurality of first gate line segments 21 connected to the first edge gate line 4 can be collected to the first diversion gate line 23 through the first edge gate line 4, and then diverted to the second interconnecting structure 82 through the first diversion gate line 23, which is beneficial to the normal use of the battery string 200. Similarly, the first interconnecting structure 81 adjacent to the second edge gate line 5 can collect the current converted on the corresponding plurality of second gate line segments 31. At the same time, the current of the plurality of second gate line segments 31 connected to the second edge gate line 5 can be collected to the second diversion gate line 33 through the second edge gate line 5, and then diverted to the first interconnecting structure 81 through the second diversion gate line 33. In addition, since the current of the plurality of first gate line segments 21 is led out to the second interconnecting structure 82 adjacent to the first edge gate line 4 through the first diversion gate line 23, the current on the first diversion gate line 23 increases. By setting the width of at least a part of the first diversion gate line 23 to be greater than the width of the first gate line segment 21, the resistance can be reduced, which is more beneficial to the collection and lead-out of the current of the plurality of first gate line segments 21. Similarly, since the current of the plurality of second gate line segments 31 is led out to the first interconnecting structure 81 adjacent to the second edge gate line 5 through the second diversion gate line 33, the current on the second diversion gate line 33 increases. By setting the width of at least a part of the second diversion gate line 33 to be greater than the width of the second gate line segment 31, the resistance can be reduced, which is more beneficial to the collection and lead-out of the current of the plurality of second gate line segments 31.

[0060] According to some embodiments of the present invention, in combination with Figure 1 and Figure 2 , the first diversion gate line 23 is located between two adjacent second connection gate lines 7, and the second diversion gate line 33 is located between two adjacent first connection gate lines 6.

[0061] For example, in the Figure 2 example, there are two first diversion gate lines 23 and two second diversion gate lines 33 respectively. The two first diversion gate lines 23 are arranged at intervals along the first direction, and the two second diversion gate lines 33 are arranged at intervals along the first direction. The second gate line segments 31 located above the first diversion gate line 23 are connected to the adjacent second gate line segments 31 through the corresponding second connection gate lines 7, and the second gate line segments 31 located below the first diversion gate line 23 are connected to the adjacent second gate line segments 31 through the corresponding second connection gate lines 7. That is, there are second connection gate lines 7 on both the upper and lower sides of the first diversion gate line 23, and there are first connection gate lines 6 on both the upper and lower sides of the second diversion gate line 33.

[0062] Thus, when the solar cell 100 is used in the solar cell string 200, the first current collecting grid line 23 is connected to the first interconnecting structure member 81 adjacent to the first edge grid line 4 among a plurality of first interconnecting structure members 81 through an insulating adhesive. The insulating adhesive increases the distance between the corresponding first interconnecting structure member 81 and the solar cell 100. By providing the second connection grid line 7, two second connection grid lines 7 adjacent to the first current collecting grid line 23 in the first direction are substantially in the same plane, and the two second connection grid lines 7 and the insulating adhesive are also substantially in the same plane. Thereby, the first interconnecting structure member 81 adjacent to the first edge grid line 4 is made stable as a whole and is not prone to displacement when connected to the solar cell 100, thereby improving the welding tensile force between the first interconnecting structure member 81 adjacent to the first edge grid line 4 and the corresponding plurality of second grid line segments 31 and the plurality of second connection grid lines 7, and enhancing the welding performance. The second current collecting grid line 33 is also connected to the second interconnecting structure member 82 adjacent to the second edge grid line 5 among a plurality of second interconnecting structure members 82 through an insulating adhesive. The insulating adhesive increases the distance between the corresponding second interconnecting structure member 82 and the solar cell 100. By providing the first connection grid line 6, two first connection grid lines 6 adjacent to the second current collecting grid line 33 in the first direction are substantially in the same plane, and the two first connection grid lines 6 and the insulating adhesive are also substantially in the same plane. Thereby, the second interconnecting structure member 82 adjacent to the second edge grid line 5 is made stable as a whole and is not prone to displacement when connected to the solar cell 100, thereby improving the welding tensile force between the second interconnecting structure member 82 adjacent to the second edge grid line 5 and the corresponding plurality of first grid line segments 21 and the plurality of first connection grid lines 6, and enhancing the welding performance.

[0063] According to some embodiments of the present invention, the ratio of the width of at least a part of the first current collecting grid line 23 to the width of the first grid line segment 21 is b 1 , where b 1 satisfies: 2 ≤ b 1 ≤ 4. And / or, the ratio of the width of at least a part of the second current collecting grid line 33 to the width of the second grid line segment 31 is b 2 , where b 2 satisfies: 2 ≤ b 2 ≤ 4.

[0064] For example, in Figure 2 the example, there are two first current collecting grid lines 23, and there are seven first grid line segments 21 connected to the first edge grid line 4. Each first current collecting grid line 23 can collect the current on the corresponding three or four first grid line segments 21, so that the current on the plurality of first grid line segments 21 can be guided to the corresponding second interconnecting structure member 82 through the plurality of first current collecting grid lines 23. As Figure 2As shown, there are two second current guiding grid lines 33, and there are six second grid line segments 31 connected to the second edge grid line 5. Each second current guiding grid line 33 can collect the current on the corresponding three second grid line segments 31, so that the current on the multiple second grid line segments 31 can be guided by the multiple second current guiding grid lines 33 to the corresponding first interconnecting structure 81.

[0065] Thus, by setting the ratio of the width of at least a part of the first current guiding grid line 23 (i.e., the thickened part of the first current guiding grid line 23) to the width of the first grid line segment 21 to satisfy: 2 ≤ b 1 ≤ 4, and the ratio of the width of at least a part of the second current guiding grid line 33 (i.e., the thickened part of the second current guiding grid line 33) to the width of the second grid line segment 31 to satisfy: 2 ≤ b 2 ≤ 4, the widths of the thickened parts of the first current guiding grid line 23 and the second current guiding grid line 33 are set reasonably, which is beneficial to the collection of the current on the adjacent multiple first grid line segments 21 and multiple second grid line segments 31. At the same time, it can also avoid the increase in the amount of material caused by the over-thickness of the first current guiding grid line 23 and the second current guiding grid line 33. Therefore, while being beneficial to the use of the solar cell 100, it can also reduce the production cost of the solar cell 100.

[0066] According to some embodiments of the present invention, one end of the first current guiding grid line 23 is connected to the first edge grid line 4, and the other end of the first current guiding grid line 23 extends at least to a position opposite to the second break opening 32 adjacent to the first edge grid line 4. And / or, one end of the second current guiding grid line 33 is connected to the second edge grid line 5, and the other end of the second current guiding grid line 33 extends at least to a position opposite to the first break opening 22 adjacent to the second edge grid line 5. One end of at least a part of the first current guiding grid line 23 is connected to the first edge grid line 4, and the other end of at least a part of the first current guiding grid line 23 extends to a position opposite to the second break opening 32 adjacent to the first edge grid line 4 along the first direction. And / or, one end of at least a part of the second current guiding grid line 33 is connected to the second edge grid line 5, and the other end of at least a part of the second current guiding grid line 33 extends to a position opposite to the first break opening 22 adjacent to the second edge grid line 5 along the first direction.

[0067] For example, in Figure 2 and Figure 3In the example, the left end of the thickened part of the first diversion grid line 23 is connected to the first edge grid line 4, and the right end of the thickened part of the first diversion grid line 23 extends to a position opposite to the second break opening 32 adjacent to the first edge grid line 4 in the up and down direction, that is, the thickened part of the first diversion grid line 23 extends to the second interconnecting structure 82 adjacent to the first edge grid line 4, so that the width of the part of the first diversion grid line 23 between the first edge grid line 4 and the second interconnecting structure 82 adjacent to the first edge grid line 4 is relatively large, which is more conducive to the outflow of the current of the plurality of first grid segments 21 connected to the first edge grid line 4, and further improves the reliability of the use of the battery cell 100. Moreover, it is also possible to avoid increasing the amount of paste used due to making the length of the thickened part of the first diversion grid line 23 too long.

[0068] For example, in Figure 2 and Figure 3 In the example, the right end of the thickened part of the second diversion grid line 33 is connected to the second edge grid line 5, and the left end of the thickened part of the second diversion grid line 33 extends to a position opposite to the first break opening 22 adjacent to the second edge grid line 5 in the up and down direction, that is, the thickened part of the second diversion grid line 33 extends to the first interconnecting structure 81 adjacent to the second edge grid line 5, so that the width of the part of the second diversion grid line 33 between the second edge grid line 5 and the first interconnecting structure 81 adjacent to the second edge grid line 5 is relatively large, which is more conducive to the outflow of the current of the plurality of second grid segments 31 connected to the second edge grid line 5, and further improves the reliability of the use of the battery cell 100. Moreover, it is also possible to avoid increasing the amount of paste used due to making the length of the thickened part of the second diversion grid line 33 too long.

[0069] According to some embodiments of the present invention, the number of the first diversion grid lines 23 is N 1 , the number of the second diversion grid lines 33 is N 2 , the length of the first edge grid line 4 is L 1 , the length of the second edge grid line 5 is L 2 , wherein, N 1 , N 2 , L 1 and L 2 satisfy the relationship: 5 ≤ L 1 / N 1 ≤ 15, 5 ≤ L 2 / N 2 . Thus, by setting L 1 / N 1 , L 2 / N 2 respectively satisfy: 5 ≤ L 1 / N 1 ≤ 15, 5 ≤ L 2 / N2 ≤15, the number of the first diversion grid lines 23 and the second diversion grid lines 33 is reasonably set, and the relationship with the lengths of the corresponding first edge grid lines 4 and second edge grid lines 5 is also reasonably set, which is more conducive to the use of the solar cell 100. For example, taking the length of the solar cell 100 as 182 mm and the width as 91 mm, the first diversion grid lines 23 and the second diversion grid lines 33 are respectively set as multiple, and the multiple first diversion grid lines 23 are arranged at equal intervals along the first direction, and the multiple second diversion grid lines 33 are arranged at equal intervals along the first direction.

[0070] For example, when the number of the first diversion grid lines 23 and the number of the second diversion grid lines 33 are both less than 7, the number of the first diversion grid lines 23 and the second diversion grid lines 33 is small, the current carried by each first diversion grid line 23 and second diversion grid line 33 is large, and the current derivation path of the first grid segment 21 far from the first diversion grid line 23 is long, and the current derivation path of the second grid segment 31 far from the second diversion grid line 33 is also long, which is not conducive to the rapid transmission of current. When the number of the first diversion grid lines 23 and the second diversion grid lines 33 are both greater than 13, the number of the first diversion grid lines 23 and the second diversion grid lines 33 on each solar cell 100 is large, which increases the processing difficulty of the solar cell 100 and also increases the material usage of the first diversion grid lines 23 and the second diversion grid lines 33. Thus, by setting the number N 1 of the first diversion grid lines 23 and the number N 2 of the second diversion grid lines 33 respectively satisfy: 7 ≤ N 1 ≤ 13, 7 ≤ N 2 ≤ 13, the number of the first diversion grid lines 23 and the number of the second diversion grid lines 33 are reasonably set, which can make the current magnitudes on each first diversion grid line 23 differ less, and can also make the current magnitudes on each second diversion grid line 33 differ less, thereby improving the stability of the photoelectric conversion of the solar cell 100 and improving the use reliability of the solar cell 100.

[0071] Optionally, N 1 and N 2 further satisfy: 9 ≤ N 1 ≤ 10, 9 ≤ N 2 ≤ 10. Thus, by setting the number N 1 of the first diversion grid lines 23 and the number N 2 of the second diversion grid lines 33 to be 9 or 10 respectively, the number of the first diversion grid lines 23 and the number of the second diversion grid lines 33 are set more reasonably. While meeting the use performance of the solar cell 100, it is more conducive to the production and processing of the solar cell 100, and can also reduce the number of the first diversion grid lines 23 and the second diversion grid lines 33 to a certain extent, thereby reducing the processing cost of the solar cell 100.

[0072] According to some embodiments of the present utility model, the ratio of the width of the first edge grid line 4 to the width of the first grid segment 21 is b 3 , where b 3 satisfies: 2 ≤ b 3 ≤ 4. And / or, the ratio of the width of the second edge grid line 5 to the width of the second grid segment 31 is b 4 , where b 4 satisfies: 2 ≤ b 4 ≤ 4.

[0073] When the battery cell 100 is used in the battery string 200, the current collected and converted on the multiple first grid segments 21 connected to the first edge grid line 4 flows to the second interconnection structure 82 through the first edge grid line 4 and the corresponding first diversion grid line 23, and the current collected and converted on the multiple second grid segments 31 connected to the second edge grid line 5 flows to the first interconnection structure 81 through the second edge grid line 5 and the corresponding second diversion grid line 33. Thus, by setting the width of the first edge grid line 4 to be 2 to 4 times the width of the first grid segment 21 and the width of the second edge grid line 5 to be 2 to 4 times the width of the second grid segment 31, it is beneficial to the current transmission between the multiple first grid segments 21 and the first edge grid line 4, and is also beneficial to the current transmission between the multiple second grid segments 31 and the second edge grid line 5, so as to ensure the normal use of the battery cell 100. Moreover, it can also avoid the increase in the amount of grid line material caused by the excessive width of the first grid line 2 and the second edge grid line 5, thereby reducing the production cost of the battery cell 100.

[0074] According to some embodiments of the present utility model, in combination with Figure 2 , the minimum distance between the first edge grid line 4 and the edge of the battery cell body 1 in the second direction is L 1 , where L 1 satisfies: 0.3 mm ≤ L 1 ≤ 1 mm. And / or, the minimum distance between the second edge grid line 5 and the edge of the battery cell body 1 in the second direction is L 2 , where L 2 satisfies: 0.3 mm ≤ L 2 ≤ 1 mm.

[0075] For example, in the example of Figure 2 , the above L 1 refers to the straight-line distance in the second direction between the first edge grid line 4 and the left edge of the battery cell body 1, and the above L 2 refers to the straight-line distance in the second direction between the second edge grid line 5 and the right edge of the battery cell body 1. When the minimum distance L between the first edge grid line 4 and the edge of the battery cell body 1 in the second direction 1When it is less than 0.3 mm, the distance between the first edge grid line 4 and the edge of the cell body 1 is small. When printing the first edge grid line 4, the first edge grid line 4 is likely to shift outside the cell body 1, which is not conducive to the processing of the cell 100. When the minimum distance L between the first edge grid line 4 and the edge of the cell body 1 in the second direction 1 is greater than 1 mm, the distance between the first edge grid line 4 and the edge of the cell body 1 is too large, the utilization rate of the surface of the cell body 1 is reduced, thereby reducing the photoelectric conversion ability of the cell 100, and further reducing the service performance of the cell 100.

[0076] Therefore, by setting the minimum distance between the first edge grid line 4 and the edge of the cell body 1 in the second direction to be L 1 satisfies 0.3 mm ≤ L 1 ≤ 1 mm, and the minimum distance between the second edge grid line 5 and the edge of the cell body 1 in the second direction is L 2 satisfies 0.3 mm ≤ L 2 ≤ 1 mm. The position of the first edge grid line 4 is set reasonably, and the position of the second edge grid line 5 is set reasonably. While being conducive to the processing of the cell 100, it can also improve the utilization rate of the surface of the cell 100, which is conducive to the photoelectric conversion of the cell 100, and thus conducive to the use of the cell 100.

[0077] According to some embodiments of the present invention, the distance between the first edge grid line 4 and the end of the second grid line segment 31 far from the second edge grid line 5 is L 3 , where L 3 satisfies: 0.2 mm ≤ L 3 ≤ 1 mm. And / or, the distance between the second edge grid line 5 and the ends of the plurality of first grid line segments 21 far from the first edge grid line 4 is L 4 , where L 4 satisfies: 0.2 mm ≤ L 4 ≤ 1 mm.

[0078] For example, in the example of Figure 2 , the distance between the first edge grid line 4 and the left end of the second grid line segment 31 close to the first edge grid line 4 is L 3 , and the distance between the second edge grid line 5 and the right end of the first grid line segment 21 close to the second edge grid line 5 is L 4。When the distance between the first edge grid line 4 and the end of the second grid segment 31 away from the second edge grid line 5 is less than 0.2 mm, the distance between the above-mentioned end of the plurality of second grid segments 31 and the first edge grid line 4 is small. Thus, during the use of the solar cell 100, the left ends of the plurality of second grid lines 3 and the first edge grid line 4 are likely to affect each other and cause a short circuit, which is not conducive to the long-term normal use of the solar cell 100. When the distance between the first edge grid line 4 and the end of the second grid segment 31 away from the second edge grid line 5 is greater than 1 mm, the distance between the above-mentioned end of the plurality of second grid segments 31 and the first edge grid line 4 is large, thereby reducing the occupied area of the second grid line 3 on the surface of the solar cell body 1, lowering the surface utilization rate of the solar cell body 1, and further reducing the photoelectric conversion ability of the solar cell 100.

[0079] Therefore, by setting the distance between the first edge grid line 4 and the end of the second grid segment 31 away from the second edge grid line 5 to be L 3 satisfying 0.2 mm ≤ L 3 ≤ 1 mm, the distance between the plurality of second grid segments 31 close to the first edge grid line 4 and the first edge grid line 4 is reasonably set. Thus, during the use of the solar cell 100, the mutual influence between the plurality of second grid segments 31 and the first edge grid line 4 is avoided, and a short circuit is prevented, so that the solar cell 100 can be used normally for a long time. In addition, on the premise of ensuring that the mutual influence between the plurality of second grid segments 31 and the first edge grid line 4 can be avoided, the occupied area of the second grid segment 31 on the surface of the solar cell body 1 is increased, the surface utilization rate of the solar cell body 1 is improved, and the photoelectric conversion ability of the solar cell 100 is further enhanced.

[0080] For example, when the distance between the second edge grid line 5 and the end of the plurality of first grid segments 21 away from the first edge grid line 4 is less than 0.2 mm, the distance between the right ends of the plurality of first grid segments 21 and the second edge grid line 5 is small. Thus, during the use of the solar cell 100, the plurality of first grid segments 21 and the second edge grid line 5 are likely to affect each other and cause a short circuit, which is not conducive to the long-term normal use of the solar cell 100. When the distance between the second edge grid line 5 and the end of the plurality of first grid segments 21 away from the first edge grid line 4 is greater than 0.1 mm, the distance between the right ends of the plurality of first grid segments 21 and the second edge grid line 5 is large, thereby reducing the occupied area of the first grid line 2 on the surface of the solar cell body 1, lowering the surface utilization rate of the solar cell body 1, and further reducing the photoelectric conversion ability of the solar cell 100.

[0081] Therefore, by setting the distance between the second edge grid line 5 and the end of the plurality of first grid segments 21 away from the first edge grid line 4 to be L 4 satisfying 0.2 mm ≤ L 4When it is ≤ 1 mm, the distance between one end of multiple first grid lines 2 close to the second edge grid line 5 and the second edge grid line 5 is reasonably set, so that during the use of the solar cell 100, the multiple first grid lines 2 and the second edge grid line 5 are prevented from affecting each other and causing a short circuit, and thus the solar cell 100 can be used normally for a long time. In addition, on the premise of ensuring that the multiple first grid lines 2 and the second edge grid line 5 are prevented from affecting each other and causing a short circuit, the occupied area of the first grid lines 2 on the surface of the solar cell body 1 is increased, the surface utilization rate of the solar cell body 1 is improved, and thus the photoelectric conversion ability of the solar cell 100 is improved.

[0082] According to some embodiments of the present invention, the length of the first break opening 22 in the second direction is L 5 , where L 5 satisfies: 0.4 mm ≤ L 5 ≤ 1.6 mm. And / or, the length of the second break opening 32 in the second direction is L 6 , where L 6 satisfies: 0.4 mm ≤ L 6 ≤ 1.6 mm. For example, the settings of the first break opening 22 and the second break opening 32 include the following situations: First, the length of the first break opening 22 in the second direction is L5, and L5 satisfies: 0.4 mm ≤ L 5 ≤ 1.6 mm, and the length of the second break opening 32 is not limited. Second, the length of the second break opening 32 in the second direction is L 6 , and L 6 satisfies: 0.4 mm ≤ L 6 ≤ 1.6 mm, and the length of the first break opening 22 is not limited. Third, the length of the first break opening 22 in the second direction is L 5 , and the length of the second break opening 32 in the second direction is L 6 , and L 5 and L 6 respectively satisfy: 0.4 mm ≤ L 5 ≤ 1.6 mm, 0.4 mm ≤ L 6 ≤ 1.6 mm.

[0083] When the length L of the first break opening 22 5Less than 0.4 mm, the length of the first break opening 22 is small, so when electrically connecting multiple solar cells 100 through the first interconnection structure 81, the distance between the side of the first interconnection structure 81 and the side of the corresponding first break opening 22 of the first grid line 2 is small. The first interconnection structure 81 is likely to contact the adjacent first grid line segment 21, so the battery string 200 is prone to short - circuit, which is not conducive to the normal use of the battery string 200. In addition, it also increases the assembly difficulty between the solar cell 100 and the first interconnection structure 81 and reduces the assembly efficiency of the battery string 200. When the length L of the first break opening 22 5 is greater than 1.6 mm, the length of the first break opening 22 is large, shortening the length of the first grid line 2 and reducing the occupied area of the first grid line 2 on the solar cell body 1, thus reducing the utilization of the surface of the solar cell 100 and further reducing the utilization efficiency of the solar cell 100.

[0084] When the length L of the second break opening 32 6 is less than 0.4 mm, the length of the second break opening 32 is small, so when electrically connecting multiple solar cells 100 through the second interconnection structure 82, the distance between the side of the second interconnection structure 82 and the side of the corresponding second break opening 32 of the second grid line 3 is small. The second interconnection structure 82 is likely to contact the adjacent second grid line segment 31, so the battery string 200 is prone to short - circuit, which is not conducive to the normal use of the battery string 200. In addition, it also increases the assembly difficulty between the solar cell 100 and the second interconnection structure 82 and reduces the assembly efficiency of the battery string 200. When the length L of the second break opening 32 6 is greater than 1.6 mm, the length of the second break opening 32 is large, shortening the length of the second grid line 3 and reducing the occupied area of the second grid line 3 on the solar cell body 1, thus reducing the utilization rate of the surface of the solar cell 100 and further reducing the utilization efficiency of the solar cell 100.

[0085] Therefore, by setting the length L of the first break opening 22 in the second direction 5 and the length L of the second break opening 32 in the second direction 6 , respectively satisfying: 0.4 mm ≤ L 5 ≤ 1.6 mm, 0.4 mm ≤ L 6 ≤ 1.6 mm, the lengths of the first break opening 22 and the second break opening 32 are reasonably set. So when electrically connecting multiple solar cells 100 through the interconnection structure 8, short - circuit of the battery string 200 can be avoided, thus extending the service life of the battery string 200. In addition, while reducing the material consumption of the first grid line 2 and the second grid line 3, the occupied areas of the first grid line 2 and the second grid line 3 are ensured, which is more conducive to the use of the solar cell 100. In addition, the assembly difficulty between the solar cell 100 and the interconnection structure 8 is also reduced, and the assembly efficiency of the battery string 200 is improved.

[0086] According to some embodiments of the present utility model, the distance between the first grid line 2 and the adjacent second grid line 3 is d 1 , wherein, d 1 satisfies: 0.3 mm ≤ d 1 ≤ 1 mm.

[0087] For example, in Figure 1 the example of, the minimum distance between the first grid line 2 and the adjacent second grid line 3 in the up and down direction is d 1 . When the distance d 1 between the first grid line 2 and the adjacent second grid line 3 is less than 0.3 mm, the distance between the first grid line 2 and the second grid line 3 is small. Thus, during the use of the battery cell 100, the current on the first grid line 2 and the second grid line 3 are likely to influence each other and cause a short circuit, and it also increases the printing difficulty of the first grid line 2 and the second grid line 3, thereby increasing the processing difficulty of the battery cell 100. When the distance d 1 between the first grid line 2 and the adjacent second grid line 3 is greater than 1 mm, the distance between the first grid line 2 and the second grid line 3 is large, reducing the number of the first grid line 2 and the second grid line 3 on the battery cell body 1, thereby reducing the surface utilization rate of the battery cell 100, weakening the photoelectric conversion ability of the battery cell 100, and further reducing the use performance of the battery cell 100.

[0088] Therefore, by setting the distance d 1 between the first grid line 2 and the adjacent second grid line 3 to satisfy: 0.3 mm ≤ d 1 ≤ 1 mm, the distance between the first grid line 2 and the second grid line 3 is set reasonably, thus avoiding a short circuit between the first grid line 2 and the second grid line 3 and reducing the processing difficulty of the battery cell 100. In addition, the arrangement quantity of the plurality of first grid lines and the plurality of second grid lines 3 is rationalized, thereby improving the surface utilization rate of the battery cell body 1, improving the photoelectric conversion ability of the battery cell 100, and further improving the use performance of the battery cell 100.

[0089] According to some embodiments of the present utility model, the distance between two adjacent first grid lines 2 is d 2 , wherein, d 2 satisfies: 0.6 mm ≤ d 2 ≤ 2 mm, and the distance between two adjacent second grid lines 3 is d 3 , wherein, d 3 satisfies: 0.6 mm ≤ d 3 ≤ 2 mm.

[0090] For example, in Figure 1 the example of, the minimum distance between two adjacent first grid lines 2 in the up and down direction is d 2, the minimum distance between two adjacent second grid lines 3 in the up and down direction is d 3 . When the distance d 2 between two adjacent first grid lines 2 is less than 0.6 mm, the distance between two adjacent first grid lines 2 is relatively small, which is not convenient to arrange the first grid line 2 between two adjacent second grid lines 33, increasing the production difficulty of the battery cell 100. When the distance d 2 between two adjacent first grid lines 2 is greater than 2 mm, the distance between two adjacent first grid lines 2 is relatively large, reducing the number of the first grid lines 2 arranged on the battery cell body 1, thereby reducing the surface area utilization rate of the battery cell 100. When the distance d 2 between two adjacent second grid lines 3 is less than 0.6 mm, the distance between two adjacent second grid lines 3 is relatively small, which is not convenient to arrange the first grid line 2 between two adjacent second grid lines 3, increasing the production difficulty of the battery cell 100. When the distance d 2 between two adjacent second grid lines 3 is greater than 2 mm, the distance between two adjacent second grid lines 3 is relatively large, reducing the number of the second grid lines 3 arranged on the battery cell body 1, thereby reducing the area utilization rate of the battery cell 100.

[0091] Thus, by setting the distance d 2 between two adjacent first grid lines 2 and the distance d 3 between two adjacent second grid lines 3 to respectively satisfy: 0.6 mm ≤ d 2 ≤ 2 mm, 0.6 mm ≤ d 3 ≤ 2 mm, the distances between two adjacent first grid lines 2 and between two adjacent second grid lines 3 are reasonably set, reducing the production difficulty of the battery cell 100, thereby improving the production efficiency of the battery cell 100. In addition, the arrangement numbers of the first grid lines 2 and the second grid lines 3 are rationalized, thereby improving the surface utilization rate of the battery cell body 1, enhancing the photoelectric conversion ability of the battery cell 100, and further improving the service performance of the battery cell 100.

[0092] According to the battery string 200 of the second aspect embodiment of the present invention, in combination with Figure 3 and Figure 4 , it includes a plurality of battery cells 100 and a plurality of interconnecting structure members 8. The battery cell 100 is the battery cell 100 according to the first aspect embodiment above, and two adjacent battery cells 100 are electrically connected through a plurality of interconnecting structure members 8.

[0093] For example, in Figure 3In the example, a plurality of interconnecting structural members 8 are arranged at intervals along the second direction. By adopting the above-mentioned solar cell 100, the service reliability of the solar cell string 200 is improved, which is beneficial to the long-term use of the solar cell string 200. In addition, a plurality of solar cells 100 can be sequentially connected by a plurality of interconnecting structural members 8 to form a solar cell string 200. The connection firmness between the interconnecting structural member 8 and the solar cell 100 is increased by the first connection grid line 6 and the second connection grid line 7 of the solar cell 100, which is beneficial to the stable use of the solar cell string 200 for a long time.

[0094] According to some embodiments of the present invention, referring to Figure 3 , a plurality of interconnecting structural members 8 include a plurality of first interconnecting structural members 81 and a plurality of second interconnecting structural members 82.

[0095] Specifically, the first interconnecting structural member 81 is respectively insulated and connected to a plurality of first grid lines 2 of the solar cell 100, and is electrically connected to a plurality of second grid lines 3 of the solar cell 100. The plurality of first interconnecting structural members 81 include a first edge interconnecting structural member 811. The first edge interconnecting structural member 811 is opposite to a plurality of first break openings 22 adjacent to the first edge grid line 4 of the solar cell 100, and the first edge interconnecting structural member 811 is electrically connected to the second connection grid line 7. The second interconnecting structural member 82 is respectively insulated and connected to the second grid line 3, and is electrically connected to the first grid line 2. The plurality of second interconnecting structural members 82 include a second edge interconnecting structural member 821. The second edge interconnecting structural member 821 is opposite to a plurality of second break openings 32 adjacent to the second edge grid line 5 of the solar cell 100, and the second edge interconnecting structural member 821 is electrically connected to the first connection grid line 6.

[0096] For example, in Figure 3 's example, the interconnecting structural member 8 extends along the first direction, and the plurality of first interconnecting structural members 81 and the plurality of second interconnecting structural members 82 are alternately arranged at intervals along the second direction. The one adjacent to the first edge grid line 4 among the plurality of first interconnecting structural members 81 is the first edge interconnecting structural member 811, and the one adjacent to the second edge grid line 5 among the plurality of second interconnecting structural members 82 is the second edge interconnecting structural member 821. The first edge interconnecting structural member 811 is insulated and connected to the corresponding first diversion grid line 23 through an insulating adhesive. At least two bonding members 9 are provided between each first interconnecting structural member 81 and the solar cell 100. The bonding member 9 can be set as an adhesive. The above at least two bonding members 9 are respectively located on two first grid lines 2 of the solar cell 100 along the first direction and close to the edge of the solar cell 100. The second edge interconnecting structural member 821 is insulated and connected to the corresponding second diversion grid line 33 through an insulating adhesive. At least two bonding members 9 are also provided between each second interconnecting structural member 82 and the solar cell 100. The above at least two bonding members 9 are respectively located on two first grid lines 2 of the solar cell 100 along the first direction and close to the edge of the solar cell 100.

[0097] With such an arrangement, the first interconnecting structure 81 can conduct the current of multiple second gate segments 31 that are opposite to each other in the first direction of the multiple second gate lines 3, and the second interconnecting structure 82 can conduct the current of multiple first gate segments 21 that are opposite to each other in the first direction of the multiple first gate lines 2, so as to achieve electrical connection between multiple solar cells 100, thereby increasing the photoelectric conversion amount of the battery string 200. In addition, by providing multiple first break openings 22 and multiple second break openings 32, the free end portions of two adjacent first gate segments 21 are separated from the corresponding first interconnecting structure 81, and the free end portions of two adjacent second gate segments 31 are separated from the corresponding second interconnecting structure 82 to achieve the insulated connection between the second interconnecting structure 82 and the second gate line 3, which simplifies the structure of the solar cell 100 and also facilitates the connection of multiple solar cells 100. Additionally, by providing the first edge interconnecting structure 811 to be electrically connected to the second connecting gate line 7 and the second edge interconnecting structure 821 to be electrically connected to the first connecting gate line 6, when there is a gap or poor contact between any one of the two first gate segments 21 connected to the second connecting gate line 7 and the first edge interconnecting structure 811, the first gate segment 21 separated from the first edge interconnecting structure 811 can be electrically connected to the first edge interconnecting structure 811 through the second connecting gate line 7 and an adjacent other first gate segment 21, thereby improving the connection reliability between the multiple second gate segments 31 and the first edge interconnecting structure 811. Similarly, the connection reliability between the second edge interconnecting structure 821 and the multiple first gate segments 21 is also improved, thereby improving the usage reliability of the battery string 200 and enhancing the usage performance of the battery string 200.

[0098] Optionally, referring to Figure 4 , a positioning member 10 is provided on the side of the multiple interconnecting structures 8 away from the solar cell 100 to limit the movement of the multiple interconnecting structures 8 relative to the solar cell 100. For example, the positioning member 10 can be set as a glue film. After the multiple first interconnecting structures 81 and the multiple second interconnecting structures 82 are arranged, the first edge interconnecting structure 811 is insulated from the corresponding first diversion gate line 23 through an insulating glue, and the second edge interconnecting structure 821 is insulated from the corresponding second diversion gate line 33 through an insulating glue. Then, the positioning member 10 is covered on the multiple interconnecting structures 8. There is no need to perform the bonding connection operation between the multiple interconnecting structures 8 and the solar cell 100, nor is it necessary to separately weld the interconnecting structures 8 to the corresponding first gate line 2 and second gate line 3. During the subsequent lamination process of the solar cell 100, alloying at the connection between the interconnecting structure 8 and the positioning member 10 can be achieved, and the interconnecting structure 8 and the solar cell 100 are firmly connected into an integral structure. Thus, the manufacturing process of the solar cell 100 is simplified, the welding connection operation of the interconnecting structure 8 is omitted, and at the same time, the stable connection between the multiple interconnecting structures 8 and the solar cell 100 is ensured.

[0099] The photovoltaic module according to the third aspect embodiment of the present utility model includes the cell 100 according to the first aspect embodiment above, or the cell string 200 according to the second aspect embodiment above.

[0100] For the photovoltaic module according to the present utility model, by adopting the above-mentioned cell 100 or the above-mentioned cell string 200, the production cost of the photovoltaic module is reduced, and the power generation amount of the photovoltaic module is increased.

[0101] The photovoltaic power generation system according to the fourth aspect embodiment of the present utility model includes the cell 100 according to the first aspect embodiment above, or the cell string 200 according to the second aspect embodiment above, or the photovoltaic module according to the third aspect embodiment above.

[0102] For the photovoltaic power generation system according to the present utility model, by adopting the above-mentioned cell 100, the above-mentioned cell string 200 or the above-mentioned photovoltaic module, the production cost of the photovoltaic power generation system is reduced, the power generation amount of the photovoltaic power generation system is increased, and the service performance of the photovoltaic power generation system is improved.

[0103] The other constitutions and operations of the cell skin, the cell string 200, the photovoltaic module and the photovoltaic power generation system according to the embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail here.

[0104] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0106] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: Battery cell body; A plurality of first gate lines and a plurality of second gate lines, wherein the first gate lines and the second gate lines are arranged on one side of the thickness direction of the battery cell body, the plurality of the first gate lines and the plurality of the second gate lines are alternately arranged along the first direction, the first gate lines and the second gate lines have opposite polarities, the first gate lines include a plurality of first gate line segments, the second gate lines include a plurality of second gate line segments, and the plurality of the first gate line segments and the plurality of the second gate line segments are respectively arranged along the second direction; A first edge grid line and a second edge grid line, the first edge grid line and the second edge grid line extend along the first direction and are respectively arranged on both sides of the battery cell body along the second direction, the first edge grid line is connected to one end of a plurality of the first grid lines, the first edge grid line is spaced apart from a plurality of the second grid lines, the second edge grid line is spaced apart from a plurality of the first grid lines, and the second edge grid line is connected to one end of a plurality of the second grid lines; At least one first connecting gate line and at least one second connecting gate line, wherein the first connecting gate line is connected between at least two adjacent ones of a plurality of the first gate line segments adjacent to the second edge gate line, and the second connecting gate line is connected between at least two adjacent ones of a plurality of the second gate line segments adjacent to the first edge gate line.

2. The battery cell according to claim 1, characterized in that: There are a plurality of first connecting gate lines, two adjacent first gate line segments along the first direction form a group, and the first connecting gate line is connected between two adjacent first gate line segments in each group; There are a plurality of second connecting gate lines. Two adjacent second gate line segments along the first direction form a group. The second connecting gate line is connected between two adjacent second gate line segments in each group.

3. The battery cell according to claim 1, characterized in that: A plurality of the first connection gate lines are arranged in a straight line along the first direction, and a plurality of the second connection gate lines are arranged in a straight line along the first direction.

4. The battery cell according to claim 2, characterized in that: A first disconnection opening is defined between the first gate line segments, a plurality of the first disconnection openings are opposite to each other along the first direction, the second connecting gate line passes through the first disconnection opening, and two ends of the second connecting gate line are respectively connected to two adjacent second gate line segments of each group; Second openings are defined between the second gate line segments, and a plurality of the second openings are opposite to each other along the first direction. The first connecting gate line passes through the second openings, and two ends of the second connecting gate line are respectively connected to two adjacent first gate line segments in each group.

5. The battery cell according to claim 4, characterized in that: Two adjacent first gate line segments adjacent to the first edge gate line are connected to each other to form a first guide gate line, and a width of at least a portion of the first guide gate line is greater than a width of the first gate line segment; and / or Two adjacent second gate line segments adjacent to the second edge gate line are connected to each other to form a second guide gate line, and a width of at least a portion of the second guide gate line is greater than a width of the second gate line segment.

6. The battery cell according to claim 5, characterized in that: The first guide grid line is located between two adjacent second connecting grid lines; The second guide grid line is located between two adjacent first connection grid lines.

7. The battery cell according to claim 5, characterized in that: The ratio of the width of the at least a portion of the first guide gate line to the width of the first gate line segment is b1, wherein b1 satisfies: 2≤b1≤4; and / or The ratio of the width of the at least a portion of the second guide gate line to the width of the second gate line segment is b2, wherein b2 satisfies: 2≤b2≤4.

8. The battery cell according to claim 5, characterized in that: One end of the first guide grid line is connected to the first edge grid line, and the other end of the first guide grid line at least extends to a position opposite to the second opening adjacent to the first edge grid line; and / or One end of the second guide grid line is connected to the second edge grid line, and the other end of the second guide grid line at least extends to a position opposite to the first opening adjacent to the second edge grid line.

9. The battery cell according to claim 5, characterized in that: The number of the first guide gate lines is N1, the number of the second guide gate lines is N2, the length of the first edge gate line is L1, and the length of the second edge gate line is L2, wherein the relationship among N1, N2, L1 and L2 satisfies: 5≤L1 / N1≤15, 5≤L2 / N2≤15.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The ratio of the width of the first edge gate line to the width of the first gate line segment is b3, wherein b3 satisfies: 2≤b3≤4; and / or The ratio of the width of the second edge gate line to the width of the second gate line segment is b4, wherein b4 satisfies: 2≤b4≤4.

11. A battery string, characterized in that: include: A plurality of battery cells, wherein the battery cells are battery cells according to any one of claims 1 to 10; A plurality of interconnecting structural members, two adjacent battery cells are electrically connected via the plurality of interconnecting structural members.

12. The battery string according to claim 11, characterized in that: The plurality of interconnected structural members include: A plurality of first interconnecting structures, wherein the first interconnecting structures are respectively insulated and connected to a plurality of first grid lines of the battery cell, and are electrically connected to a plurality of second grid lines of the battery cell, wherein the plurality of first interconnecting structures include a first edge interconnecting structure, and the first edge interconnecting structure is electrically connected to the second connection grid lines; A plurality of second interconnect structures are respectively insulated and connected to the second gate lines and electrically connected to the first gate lines. The plurality of second interconnect structures include a second edge interconnect structure, and the second edge interconnect structure is electrically connected to the first connection gate line.

13. A photovoltaic module, characterized in that: The method comprises a battery cell according to any one of claims 1 to 10, or a battery string according to claim 11 or 12.

14. A photovoltaic power generation system, characterized in that: It comprises the cell sheet according to any one of claims 1 to 10, or the cell string according to claim 11 or 12, or the photovoltaic module according to claim 13.

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